多物源储层分区耦合建模方法及应用

A method and application of partitioned coupling modeling for multi-source reservoirs

利用传统分区岩相建模方法模拟多个物源方向的储层空间分布时,模拟的砂体在分区边界处多呈突变接触,不符合地质认识。为此,提出了一种多物源储层分区耦合建模方法。首先根据不同物源影响范围将研究区划分为若干区块,然后按一定顺序依次模拟。提取先模拟分区边界上的模拟结果作为相邻后续模拟区块的条件数据,并结合后续模拟区块中的井点数据进行模拟计算,保证了分区边界上模拟砂体的连续性。最终得到整个研究区的砂体模型,模拟的砂体在各个分区边界处均连续分布。以东营凹陷盐家油田盐935-936区块沙四段上亚段为例进行了应用研究,并与传统的分区岩相建模和基于局部变化变差函数建模方法进行对比,结果表明,该分区耦合建模方法可以更真实地构建研究区的三维地质模型,解决了传统分区岩相建模方法存在的各区块边界处砂体突变的问题,提高了建模质量。

When the traditional partitioned modeling method simulates reservoir distribution with multiple sources,the sim⁃ulated sandbodies show abrupt contact at the boundaries between segments,which does not conform to geological under⁃standing.Therefore,this paper proposed a partitioning coupled modeling method for multi-source reservoirs.Firstly,the re⁃search area was divided into several segments according to the influence ranges of different sources and then each part was simulated in a specific order.The simulation results on the segment boundaries modeled earlier were extracted as the condi⁃tional data for the adjacent segments modeled later.After combining the well-point data within the segments modeled later,the simulation calculation ensured the continuity of the sandbodies at the boundaries between segments.Finally,the sand⁃body model of the entire research area was obtained and the simulated sandbodies were continuous on each segment bound⁃ary.This paper performed the applied study with the upper sub-member of the fourth member of the Shahejie Formation in the Y935-936 block of the Yanjia Oilfield in the Dongying Sag as the example.The proposed method was compared with traditional partitioned modeling and the variogram modeling based on local variations.The result demonstrates that the par⁃titioned coupling modeling method can build a more realistic three-dimensional geological model of the research area,elim⁃inating the abrupt contact between sandbodies induced by traditional partitioned modeling and improving the modeling quality.